From 1bbf246462f4f47904227c82f8b841401b6f2897 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Mon, 25 Nov 2002 21:53:14 +0000
Subject: [PATCH] Fix a couple of bugs in host_pcib_get_busno(): - If a PCI
 device is not present, then a 32-bit read_config() is going to   return
 0xffffffff not 0xffff. - For the 82454NX chipset, the MIOC that we read the
 bus numbers of the   various host-PCI bridges from is at function (slot) 0x10
 not 0x0.

Approved by:	re (rwatson)
---
 sys/dev/pci/pci_pci.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/sys/dev/pci/pci_pci.c b/sys/dev/pci/pci_pci.c
index 31d97f814239..a0e864ac90aa 100644
--- a/sys/dev/pci/pci_pci.c
+++ b/sys/dev/pci/pci_pci.c
@@ -457,7 +457,7 @@ host_pcib_get_busno(pci_read_config_fn read_config, int bus, int slot, int func,
 	u_int32_t id;
 
 	id = read_config(bus, slot, func, PCIR_DEVVENDOR, 4);
-	if (id == 0xffff)
+	if (id == 0xffffffff)
 		return (0);
 
 	switch (id) {
@@ -488,19 +488,19 @@ host_pcib_get_busno(pci_read_config_fn read_config, int bus, int slot, int func,
 		switch (slot) {
 		case 0x12:
 			/* Intel 82454NX PXB#0, Bus#A */
-			*busnum = read_config(bus, 0, func, 0xd0, 1);
+			*busnum = read_config(bus, 0x10, func, 0xd0, 1);
 			break;
 		case 0x13:
 			/* Intel 82454NX PXB#0, Bus#B */
-			*busnum = read_config(bus, 0, func, 0xd1, 1) + 1;
+			*busnum = read_config(bus, 0x10, func, 0xd1, 1) + 1;
 			break;
 		case 0x14:
 			/* Intel 82454NX PXB#1, Bus#A */
-			*busnum = read_config(bus, 0, func, 0xd3, 1);
+			*busnum = read_config(bus, 0x10, func, 0xd3, 1);
 			break;
 		case 0x15:
 			/* Intel 82454NX PXB#1, Bus#B */
-			*busnum = read_config(bus, 0, func, 0xd4, 1) + 1;
+			*busnum = read_config(bus, 0x10, func, 0xd4, 1) + 1;
 			break;
 		}
 		break;